function showImg(id, img_uri, a_uri )
{
    window['img_' + id] = '<style>a{text-decoration:none;}img{border:none}</style><a href="' + a_uri + '" target="_blank"><img height="200" src="' + img_uri + '" alt="" /></a>';
    document.write('<iframe src="javascript:parent[\'img_' + id + '\'];" frameBorder="0" scrolling="no" height="200"></iframe>'); 
} 
